"diagonal" in the noun sense
geometry) a straight line connecting any two vertices of a polygon that are not adjacent
2. diagonal, bias
a line or cut across a fabric that is not at right angles to a side of the fabric
an oblique line of squares of the same color on a checkerboard
"the bishop moves on the diagonals"
mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry
5. solidus, slash, virgule, diagonal, stroke, separatrix
a punctuation mark (/) used to separate related items of information
"diagonal" in the adjective sense
connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face
"a diagonal line across the page"
2. aslant, aslope, diagonal, slanted, slanting, sloped, sloping
having an oblique or slanted direction
Source: WordNet® (An amazing lexical database of English)
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